Method and arrangement for transferring signals between moving vehicles and roadbeds



March 6, 1928. 1,661,744

w. WUR'ST METHOD AND ARRANGEMENT FOR TRANSFERRING SIGNALS BETWEEN MOVING VEHICLES AND ROAD BEDS Filed Aug. 9. 1924 WALTER WURST INVENTOR ATTORNEY Patented Mar. 6, 1928. I

WALTER WITBST, F BERLIN, GERMANY,

NT- OFFICE.

Assrenoa r0. enssrnscnarr rba pm.

LOSE rnnnenarnm m. B. H., or RLIN, GERMANY, A oonrone'rrorr on em.-

MANY.

Marisol) am) ARRANGEMENT r03 rnansrnanme sIeNALs' vamonns AND noammns.

application filed August 9,1924, Serial No My invention-relates to a method and arrangement for signaling between moving vehicles, such as railroad trains, and a sta- V tionary location along the road bed, as, for

which:

instance, a location on the track.

It has for its object to provide such, a

method and arrangement whereby a positive and certain Signal is obtained when the vehicle passes'the said ocation.

Other objects will'be pparent from the following description and claims when considered with the accompanying drawing, in

Fig. (1 is 'an' arrangement embodying one form of my invention.

Fig. 2 is a modification. v According to the present invention a tube transmitter with inductive grid coupling is employed and this grid coupling'is so loose- 1y chosen that no oscillations normally are generated. Only when the grid coil and the plate coil are nearing a receiving circuit tuned to the frequency of the oscillatory circuit, do oscillations setin. The alterations of current produced by the starting of the oscillations affect a signaling relay.

Fig. 1 shows an example of the schematic connection of the present invention. 1- is the anode current conductor and '2 the filament line is a closed H relay, the oscillatory circuit arranged on the transmitter and 35 hn current conductor, 3 the cathode tube generator, 4 the oscillatory circuit, 5 the inductive grid coupling coil. 6 is an oscillatory circuit tunedto the frequency of the arranged on the railway e. "According to the main application and to Fig. I of the present application, the oscillatory circuit arranged on the railway circuit.

. In order to attain an increased insurance against an undesired release of the signaling railway line can also be so dividedthat one part of such an oscillatory circuit is arranged on the locomotive itself and the other part on the railwa line', that is, the osci1- latory circuit on t e line may be an open clilrcuit. Fig. 2 shows this embodiment of t e present invention. 21 is the anode conductor, 22 the wire connecting the cathode ,to the anode circuit and, grid circuit of the ian'rwum'r novnte .asrdae, and 1.. eelan September a, 192:.

vacuum tube, 23 the grid connection, 24 the oscillatorycircuit, 25 the inductive grid coupling coil as explained in connection with Fig. 1. 26- is that part of the receiving circult tuned to the frequency of the oscillator on the locomotive, and 27 is the other part of this receiving circuit. Fig. 2 shows that the open circuit 27 arranged on the line is combined with the part arranged on the locomotive into a closed oscillatory circuit only this location on the line.

It can thus be seen that regenerative oscillation will occur onl when locomotivejs in the particular locatlon of the tuned cirxcuit. When this occurs the change of current in "the plate circuit or otherwise will actuate a relay coil (not shown) or other equivalent devlce to show the des red signal.

Having described my invention, I claim:

1. In combination, a regenerative vacuum.

tube circuit having a loose coupling betweeninput and output circuits, andmeans for closely coupling said circults when brought.

means the tube circuit when the coupling th are brought into efiective relation the tube circuit.

input and output circuits mounted on a:

mounted on a stationary ody whereby oscillations are developed m 3. In combination, a three electrode oscillator having anode and grid coils spa0od apart from movable body, and stationary coils for coupling to the movable coils havin tuning means attached thereto whereby t e movable coils may be. inductively coupled to produce oscillations in the oscillator.

4. In combination, a normally non-oscillating oscillation generating" device mount ed on a movable body, means for causing 08-.

cillations therein mounted on a stationa bodytwithin range of the route taken by the movable body and means .for relatively adeach other and mounted on a 60 when the locomotive approaches justing the frequency at which oscillations body and means for relatively adjusting will be produced mounted on said stathe frequency at which oscillations will be tionary body. produced mounted on said stationary body, 10 5. In combination, a normally non-osciland means for predetermining the frequency 5 lating oscillation enerating device mountat which oscillations will occur mounted on ed on a movable ody, means for causing the movable body. w oscillations therein mounted on a stationary WALTER WURST. 

